A: A blood moon is a deep reddening of the moon caused by the Earth passing between the moon and the sun. During the period of the eclipse, light from the sun... Full Answer >
Sometimes, bones are the only accessible source of DNA, thanks to their structure, which preserves DNA comparatively well and for a long time. The main problems of DNA extraction from bones are DNA degradation due to environmental factors and the presence of soil-derived inhibitors like humus acids [1â10].
The mitochondrial DNA from a fossil femur found at La Sima de los Huesos or the Pit of Bones in Spain could be from around 400,000 years old. This represents the oldest human DNA material yet recovered,â Professor Stringer said.